I'm new with BlocklyProp and SimpleIDE and thought I'd start with a strip of WS2812Bs and an OLED on an Activity Board. I've done the basic "Hello World" with just SimpleIDE, then with BlocklyProp and all worked well. I then tried to light up a single WS2812B and it didn't work ... lit some colors ... not what I wanted ... sometimes didn't light up at all. I tried a string of 8 with 7 of them dark. It didn't work any better. The OLED worked fine. I've checked connections. The string of 8 had been used before with Spin. Attached is the C code.